> -----Original Message----- > From: Randy Dunlap [mailto:randy.dunlap@xxxxxxxxxx] > Sent: Thursday, September 25, 2008 3:40 PM > To: scsi > Cc: Jens Axboe; Miller, Mike (OS Dev); James Bottomley; lkml; akpm > Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr > > On Thu, 25 Sep 2008 13:33:07 -0700 Randy Dunlap wrote: > > > Jens Axboe wrote: > > > On Thu, Sep 04 2008, Miller, Mike (OS Dev) wrote: > > >>>>>> 0x3bb2 <do_cciss_intr+1649>: mov 0x2(%r8),%dx > > >>>>>> 0x3bb7 <do_cciss_intr+1654>: test %dx,%dx > > >>>>>> 0x3bba <do_cciss_intr+1657>: je 0x3f0e > <do_cciss_intr+2509> > > >>>>>> > > >>>>>> > > >>>>>> $ addr2line -e cciss.o -f do_cciss_intr+0x627 SA5_fifo_full > > >>>>>> > > >>> > /home/rdunlap/linsrc/linux-2.6.27-rc3-git7/drivers/block/cciss.h:2 > > >>> 06 > > >>>>> OK ...that's confusing. It seems to be saying that > ctrlr_info_t > > >>>>> * was NULL. However, I can't see a way of getting into the > > >>> fifo_full > > >>>>> callback from do_cciss_intr .. > > >>>>> especially not with an NULL host. > > >>>>> > > >>>>> James > > >>>> That is weird. Even if we could get there fifo_full doesn't > > >>> do anything but wait for a bit. > > >>> > > >>> Hi, > > >>> > > >>> This just happened again. This time it's on 2.6.27-rc5-git3. > > >>> > > >>> ~Randy > > >> Thanks Randy. I think. :) > > >> > > >> I'll try to recreate in my lab. > > > > > > This looks somewhat strange, mostly like 'c' is NULL and it's > > > oopsing in in removeQ (I don't think Randy's analysis is > correct in > > > assuming it's 'h' and it's in fifo_full). Given that 'c' > cannot be > > > NULL, it's c->prev or c->next that are NULL. > > > > Yes, correct IMO. I checked my daily test logs and I have had this > > problem in do_cciss_intr() 3 times, all at the same location, which > > appears to be in removeQ(), as Jens says. > > Mike, also notice this: it's always during driver init, as > indicated by the (+) in the dump ('+' means that the module > is in the process of being loaded, but module load has not completed): > > calling cciss_init+0x0/0x2e [cciss] > HP CISS Driver (v 3.6.20) > ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 54 cciss > 0000:42:08.0: PCI INT A -> Link[LNKA] -> GSI 54 (level, high) > -> IRQ 54 > cciss0: <0x3238> at PCI 0000:42:08.0 IRQ 503 using DAC > BUG: unable to handle kernel NULL pointer dereference at > 0000000000000248 > IP: [<ffffffffa001bb68>] do_cciss_intr+0x627/0xa6c [cciss] > PGD 17e422067 PUD 17e423067 PMD 0 > Oops: 0002 [1] SMP > CPU 2 > Modules linked in: cciss(+) ehci_hcd ohci_hcd uhci_hcd > Pid: 0, comm: swapper Not tainted 2.6.27-rc3-git7 #1 > RIP: 0010:[<ffffffffa001bb68>] [<ffffffffa001bb68>] > do_cciss_intr+0x627/0xa6c [cciss] Thanks, Randy > -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
